I think you can't find a engine with a ignition more then 30 degrees BTDC.
The highest I can find will be 23 degrees BTDC, this will be a very large engine and a low rpm runner.
This kind of engines need the time after ignition to burn all the petrol.
Our engines, 25 till 50 ccm have 18 or maybe 20 degrees BTDC.
Why we will the pickpuppoint to 40 degrees...we need the time to calculate the real ignitiontime.
The real ignition it selfs must be between 0 and 40 degrees BTDC, above 40 degrees BTDC is not possible.

BTW, forget multi spark.
Into a big room you need multi bulbs to light up te room
Into a small room you need only one bulb to light up te room and sometimes even one bulb is given to much light.
Our engine have a very small cilinder and we put less petrol into this engine like they do in cars.
Both engine have one cancle to spark up the petrol.
Into the car engine the have to fire a lot of petrol, so they need more sparks to burn all petrol.
Our engines have also one cancle, but the petrol we put into our cilinder is lees then they use into a car engine.
So why do we need multispark........it takes only energie we need so bad for this one heavy spark we can make with the HV-board.